Implement data structures from X.680, X.501, X.509, and PKCS#10, with X.690 encoding / decoding support

The implementation took four days, and it is still a little bit rough. Updated version should arrive soon.

Signed-off-by: Yuuta Liang <yuutaw@students.cs.ubc.ca>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/main/model/asn1/Bool.java b/src/main/model/asn1/Bool.java
new file mode 100644
index 0000000..d9f1851
--- /dev/null
+++ b/src/main/model/asn1/Bool.java
@@ -0,0 +1,60 @@
+package model.asn1;
+
+import model.asn1.exceptions.ParseException;
+import model.asn1.parsing.BytesReader;
+
+/**
+ * Represents the ASN.1 BOOLEAN type. It always has one byte length. Its content is either 0xFF (true) or 0x00 (false).
+ */
+public class Bool extends ASN1Object {
+    /**
+     * The X.680 universal class tag assignment.
+     */
+    public static final Tag TAG = new Tag(TagClass.UNIVERSAL, false, 0x1);
+
+    private final boolean value;
+
+    /**
+     * EFFECTS: Initiate the BOOLEAN with the given tag, an optional context-specific tag number for explicit
+     * encoding, and its value. For more information, consult {@link ASN1Object}.
+     * REQUIRES: Consult {@link ASN1Object}.
+     */
+    public Bool(Tag tag, Tag parentTag, boolean value) {
+        super(tag, parentTag);
+        this.value = value;
+    }
+
+    /**
+     * EFFECTS: Parse input bytes. For more information on tags parsing, consult {@link ASN1Object}.
+     *   Throws {@link ParseException} if the input data is invalid:
+     *     - The length is not 1
+     *     - The value is neither 0x00 nor 0xFF
+     *     - Other cases as denoted in {@link ASN1Object}
+     */
+    public Bool(BytesReader encoded, boolean hasParentTag) throws ParseException {
+        super(encoded, hasParentTag);
+        if (getLength() != 1) {
+            throw new ParseException("Invalid boolean length: " + getLength());
+        }
+        final Byte val = encoded.require(1, true)[0];
+        if (val == 0) {
+            this.value = false;
+        } else if (val == -1) {
+            this.value = true;
+        } else {
+            throw new ParseException("Unknown boolean value: " + val);
+        }
+    }
+
+    /**
+     * EFFECTS: Encode the boolean to either 0x00 or 0xFF.
+     */
+    @Override
+    public Byte[] encodeValueDER() {
+        return new Byte[]{ value ? (byte) -1 : 0 };
+    }
+
+    public boolean getValue() {
+        return value;
+    }
+}